Sentence Correction (SC) | Researchers explain, being very eager to have constant access to fo

If you want to match the subjects, then the real subject of the first part is the 'researchers. However, 'baboons' is only the subject of the subordinate clause. The situation is really leading to some dilemma. For all that, one may say that baboons are the logical contenders. So far so good and therefore, E is passable.
However, my point was that one shouldn't t rule out B or A on pronoun ambiguity, but on other counts.